1 files changed, 4 insertions, 1 deletions
diff --git a/ifparser.c b/ifparser.c
index 631b4f0..42138f8 100644
--- a/ifparser.c
+++ b/ifparser.c
@@ -338,7 +338,10 @@ parse_product(IfParser *g, const char *cp, long *valp)
 
     case '%':
         DO(cp = parse_product(g, cp + 1, &rightval));
-        *valp = (*valp % rightval);
+        if (rightval)
+            *valp = (*valp % rightval);
+        else
+            *valp = LONG_MAX;
         break;
     }
     return cp;